i think it could end up being a slow-burner style that grows in popularity. its sort of vague in that yes, there is the BJCP "original" vienna lager that has fairly tight numbers and tastes.
but really, it could range from ~4SRM 100% vienna beers, all the way to pretty roasty example with maybe up to 4% chocolate malt even. just keep the crystal down.
the one im making now has no colouring so its about 6 or 7SRM and orange.